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Breaker Lock

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Breaker locks are used to prevent someone from accidentally turning-on a breaker which has been switched off by a maintenance worker or contractor in compliance with OSHA's Lockout/Tagout standard. Usually used in conjunction with lockout tags that explain the who and why the breaker was locked-out. The model number shown below is specifically for the Square D QO single-pole breaker but there are versions for all the major manufacturers. You have to pay very careful attention to the catalog description to see if it fits the specific model of the manufacturers breaker you are trying to fit.